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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8637cc397f270b2759d47a7b4995b22e3e203c010216219952d4df862f08c7d2' 
  AND token = 'YSxPzl5dHsxOmyP66fRgBd8YOyUPI/mntdYyNkwhSYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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