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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708ad4e6f499cf303f6e154b0db57cede3b06c2fdf310d210dc7aa682f16cf9d' 
  AND token = 'lS2BhqBBN3APPqrpr1Y906mS5z8XrUjtLXdcR61occ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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