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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176025d281d4b809ff42a74638e7b5a85b1c786d513ab6abf2e5faba4703a02f' 
  AND token = '0vWxeaY2dDnzP4xWvISVa0WEKcSxZb7U/OdWxyM4ivw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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