SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e333aaab7cbc5009c138e96322c56b214b593f81ee73056abad8ba37978be7bc' 
  AND token = 'HFvuMJz2rpkWWdGQhFga9vXq/T3T2Y3n9UTK+ZQfkgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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