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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944478baa069ecb1a207a6507ea3458fc0c63aef6dbe69c1c89e65a7072ebc9e' 
  AND token = 'buqdNqrwEPhDK9EEjmJg8gwkr62f4Nu947q15w71/tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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