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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7022e800bc17ef4fd1eddb7696dc27285b76a37b0c5e5e97574bd8dd0818664' 
  AND token = 'dbtsgXFHTvsHspdfIDpmYBPV2YPMgXbs8uB3VHqcOiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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