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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe5c6d584c5293587a24cef0a649023dd419c23de58f0caebf329b0c4a95479' 
  AND token = '5054P2qPJKGFlrjty6tT9mOB1uoZ8Vc+bLypvbc6JrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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