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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80948c4628639542a9c556250cef78f6c1790399af74b37c92eafef0519505ee' 
  AND token = 'afWN28fTiIY3X6h9EUV8Ilr85+QGeCPpObyJNd+osn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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