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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342569dde037a51ed952610fe8e09b19d0399c37514c259b9c68e407cc978737' 
  AND token = 'dy6T6qfV+OicEOutibAWTOKec+89aoXSCoLSdv63DPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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