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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0211ff078e239c63e858ee4e036944068f26c91dacc5f4f56de4de885b0ab85' 
  AND token = 'aqPXaAxrz9Ff3L5bYR7qLeLpFS8/uXFJOo6JXqDRT/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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