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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf410f7117852239642352c37b624d3754eceedd729997b8efe4a4ce5e71d34d' 
  AND token = '4gPSjID+OGXK9yhV6Vai2Wl90eUkc9S99NeMG/5wTvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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