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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca6dda6163c330a69146b93a41fe18466aee2cb9d8496130b1476a5a5409e5e' 
  AND token = '969pdxmby7Eklt1EjiSkunIF6wq195yppPb55TON+mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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