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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4173d7fad673bd8f80c260dc016c658a491aa246021231575d08e1613e835278' 
  AND token = '07sFTK7lDlb/zHzxh+ZJPli3IVh976prChEa8/Gryus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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