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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8aba180d5cae8c9bc86db617cbcf0af170d8c0d287fde00d29f0a153a361e3c' 
  AND token = '5bLuYb/pExOx6+J0zZ6niHDBEaHt579/jKue+erredg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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