SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0dc77f37641c56fb09ae7247e41d7265b975095fae9270a8d89f00618b18a7' 
  AND token = 'vTp49lPJsTKw+F2Gn6Y07URxwz/g+EyFNGq9nTRLGls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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