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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f7e5f2c4785e93e3886a935dd53e22e27ae1653f8b101854031aa84560ddce' 
  AND token = 'IL7C7ujPYj47uvGbOdn6TdcrtstO/9glkvDb1gv5N+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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