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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85fc16df22942cc2e814e30f1a542f140e361b1948b5456ce09a5715bdd87f9' 
  AND token = '/VgKmkoie0I5SCiQr8QLCBF6mjfz8Ct5JChnTLakxwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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