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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331f86d253f6701c50ace543d34b9b286598ea2d9be34654cefd5e629059479a' 
  AND token = 'FNDMZE5naDGCifhseUJuHRef4NdS+JMvKFKj7PI2qhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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