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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac72257ef82170c5922427ec227e6f31e525eccb5dfc352ad5abd1b7f5f3eef1' 
  AND token = 'BKLJtUqLCMNS+bTcuIOzIFhyWCQphrV+zdD4CHS+BLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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