SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4fd916f6943f18794a174cc52449360f58674b15fc711e329eba78c9ab0d89' 
  AND token = 'I0h2/ti8qi8obIQ+61pdByWAd72YYg7J6surcLm1ucs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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