SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1769234dac2c5033f9c692955f8fb781b4501ee961843840ea38ad0f1fabd62' 
  AND token = 'lqQiItwAG4+khBedAldGRzjc2UHmXEjS2R+dZCy5XeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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