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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1191117d2e9ba0db2f03e5727fedff7be34303942cf45121f7d538a70a7b72c5' 
  AND token = 'AiltuR5iVuu8gzg0aJPaBut1ToAvlraXMkh+PtabNZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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