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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dbde1fc20b171d8cef8e892c7e70dfc7c770ace969a33874dd77f6c37c7457' 
  AND token = 'YFlRQLJW7vLTFANNE0WqGOd2vbOojSdhXs3pHF8xamc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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