Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2c5d0e05021a3810842eee92424982a45631769457395076df05929ee9b7b3' 
  AND token = '5PU8LAq7k61tqmZLb5/4rxlXZKgMdV4nutPZwpW94ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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