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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93bb4fe4cd33a32b39fa2e8efb626e582849fe1a616280812bf01fc1cc4509a' 
  AND token = '0a9l6SvNh4dqI+ZDuZGczZiVDxGjPVbUNoplXzIS2iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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