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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f42495909cc7631bd615b152fd1003d5c3cc76054ab126bce820809a93f741' 
  AND token = 'yeU/M8OdxSrJQep6PqE4rGG8xiA+C6Hjcsca0MlXZuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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