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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e047a347ae9dbc3f9616b57ae51606a3e88a3a64fa809015eb8bc4890f5bff6' 
  AND token = 'lcWIoWmhaZrNKMDpBUpPwZ4hXKgyUBLvahfKN7H17io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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