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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f36a913dbefff48910b3ae49cd2503cbe5879325285027c50a7d64a91dd60d1' 
  AND token = 'lf4ja7XtCE9iX2ai2X5IN61fJiUvoStaAp2I9A98if8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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