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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68e89549e35c4ddb2004ec3ff32e49a234913bf311a8c2aa1a470024675819b' 
  AND token = 's8dDdcImAaT7xxkpfRtRVIa4+JE/2g58G8spOAbMF2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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