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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67df75d649d981803102dc0a955ff75c42495dd2957abd192d3b5c244d4ec085' 
  AND token = 'A+aZ12XkObfpkUdKAVaXaWyrcxrd09d+o2RU3YzbWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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