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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a9b0f0226f7c914ffca181da07e499f081ac49d57b12177b79993e1a356c04' 
  AND token = '004de3GEnPHRVB8HajJpTAMyfly1IhjMTVR7WJzdZ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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