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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb77929dd4fd137510b7c0b7505c8a055950d2004293b1c7d91034a8b4993b2e' 
  AND token = 'ka3ePrwiufyE+UjurEb3uBv97Hmp0piwxTOFUGvm6hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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