SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7965e5c6b749e78c7e276a2c423f31d7e01368bf38e0322319c627d87c590dc6' 
  AND token = 'GBtz7YwBlgfB9giq7Cquz37PSP7zwIZlaY4mmrvzHwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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