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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047578adb2672d9f0d1c44d5f158daad9686c09bec4c598b0c5d1dc304994d24' 
  AND token = 'cqiPQa3hQRltwQQiQQcitdWXgrE+BBWmAopb2tNbuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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