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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246e781e0db0c2668eae0c4b749fbc1b6a3d51cc978be96e61a84771ea45cc34' 
  AND token = '+rrn2Kt5WylUvZ5VpnjLYj1cBCMa/EibKXKK5/fjnGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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