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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da15425443e766c5cf0face8a1eca23113e4ed0999f6572263c3395e7c4753cd' 
  AND token = '0I+uKM8MsUE6oyfVUwmh1IAPAYc8Hm6qqFDLE26m9iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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