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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c35e01f882d6ce42ee51dfe0d98acdd7b552f0495ad09377b738185ba1685f6' 
  AND token = 'LZGMgQIXQn38c22Itpa+TB046pBXzqrvAXV1hTkGXns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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