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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b99c925c95115e456ea0df6a90b69162a3d03a00bbd3f0cd2a6ccd8fc90be5' 
  AND token = 'uXNxJVeCGIOsL/icyQywOSklLvP7Zm+AiLoEu+51wQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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