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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1812b3b37ebc65a562841c393eece1bbeda5ecf83329cfea608fe993fe4aec55' 
  AND token = '/209YkYDT+QO8emSmpb4QzFyfeO1uTiTu+lAcTqeEHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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