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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b758566f8674c6940428d6cde7689bd16325f0c094c157490e96a3ea5a166b3' 
  AND token = 'BbpoLc7JxW4KS841F4Ytcu3pLgmL4hAksK2IKuDMc8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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