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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccb3c6fea27c4cda1bd9f97a15906dba5642d8c0b0c05cd56d7ac0198b4017a' 
  AND token = '1tnUM5gs7jInI+3LtjDO7lTAxyUW4KBraStY5GpEguY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}