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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bdd65a4ccb1da82c46f90d201cc42d5fc0f5f947a24943355b635a2d69185c' 
  AND token = 'SmZDDjKzDluRbCmnmRh5ttieTvORZtUnsPsW2gx8J/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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