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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc9b8874cfc365186da57193c1200be7756a18fe62bf80d9bac69ead52b66bb' 
  AND token = '3zan8ZwMLcm5NjrHTVQt7HrlFfMc04AarssntjYWNaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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