SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f50699d5c3c670f7be07a4d1cbaea9334326545c6547760b71970b67bf633ed' 
  AND token = 'wIcsRP2CDigFIEiqw8iVhKyPB/hNqOtIiyM5ZBQ+cNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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