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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c3eefba646bd7b70f46906a28c478d77b6fa5072edb9a2306056a10daf52fc' 
  AND token = 'E5e7gC755E2ok34rqZxoPV7cmye4FtDtYCmsE98xsfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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