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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162db310f256bb47dfc03490711df4415537baf33c18955c33ace7805acde1e7' 
  AND token = 'xeW2peEInMAPQIZXVtG6su6BIs6AhL9sm917V+E0a2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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