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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9177c99dae591814633a7d19adbcac6777be3c93fe6fbaa513e9582ebf8c5811' 
  AND token = '88LjCn4YWI8KcP4FaaA8kKUqHKXhkczELxuiC9n/ASY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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