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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1659017d9f692678b21aa57f551ce177bf957e2a1b563c24fa267993a9887e23' 
  AND token = 'kfTWSk502wbxrc/TKu6e2Cl90S1znqnsmfOMH7KXDJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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