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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605d865361ce2848259abb05cdda1e38961724707c72cebe37f01443a647855f' 
  AND token = '/tTedPpZpvBxE6QQstxsGcVen9HBLOK/kVs/p02E7uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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