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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba0d2b61797cf4274908422c079a9990ec89c2f54dad2ffc2ff54b40992aada' 
  AND token = 'MQ9z0F2fyBhgOmKm0dnJlTJ8Gnh1CvIMTlBfw7+XOqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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