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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57adad711ea6910cfc7d9c0b9122261e3aa2d3fda271d10413d0f82c27e235d7' 
  AND token = '9V4oYn0rwNbFQfL/y4B9aqMZhoY0qi1LQYoXBHLwS84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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