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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1486a90a7a7ae3ed458e012e2152a067bbf39642540025cced71ae1529c81129' 
  AND token = 'Dqp+j/tqd1bwl0aCZJ+qjhO8Cd8pfOz0wO5HJxd2sFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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