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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9c7de47fd7338e7a86a58a73e2560915d023e42771509637ae26f60f3acf61' 
  AND token = 'xVPlQ+w/x26vUPRSXEtB2qMhNk7X0RYanJzytiPzFI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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