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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4cc0beb90bbbe48a070a67295328760be7c03d0fb97acf64a94d77fd424940' 
  AND token = '3ccWKTsvdwyc8BUvk1ugXMheA63qZPYiUryj6bbux3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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