SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776b2542f9282311fe7279fd64cf9a24b24436c336f2b9f473e9691c241289d8' 
  AND token = 'rB6WihYS4hUw5ZsjQqNE1rbO009rLQNuJHnnXjG+dsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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