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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca22e95e5b65979b1fd00f4cfb2c1ea4102861e734f777d90147ba97d1373c9' 
  AND token = 'dY9LQZnASiaclEgUu4KWR1hZOGqgfQSZxGbm5LgWTeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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