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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48ffad3ca7038930e03188fee1e4653e6f3b8d693b7439d71ff432de9a6e6c3' 
  AND token = 'jbijGY9zb8871uA5UEr/PKYcC9mJa1xDLFGZtEb8c8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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