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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccecc141237b2a308b3b4da70b0ee7b03b857d9d9da7d892aafc7c8711281a6e' 
  AND token = 'mmHPXtQPAvJI4yoIPEqbdSnN4p4yLhFoUSPrVmx4iTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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