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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60eb0d5f14488aac624d26bb81c1be317b6ef27199740641b45043ecc8a0ca8' 
  AND token = '3pvfWZuab7RoNwgttYxn4rPzIOK0CeRDHcJ8FOSUG/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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