SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcca64d9b378f2fb771f582e32296c9af87444046187dad80747643849f7130' 
  AND token = 'QmErruHkBMZ86x/WYZCgAoGlK2xIw+EP7vHZQzAMup8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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