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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d079a2972073ef64c922334ef3ae92a4e5186a948090a64cea2c583f449ab16' 
  AND token = 'lkjARQ+YOgJ/YX3AgHaTUf6o46cV8cJZQfOj1GLzHPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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