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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0772da9c53760d6d6c03e8af5ffbeb99c06cf42c002f74b2539cf0760b7427e' 
  AND token = '/kKcL57ZdlwrxgT7biFSDju89ImGmikbYU+xd5M4c30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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