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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd5440c388d79351b4067fa5289f1a91d7ca6691cc4fb66662e9cb49542610f' 
  AND token = 'USgtJCopAgRwNSnq8nTEASU9Bj9HXBoF5roF71WxzzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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