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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c149cf75a6669cacc880b2e775735af572c4a73235951467d1a24635c3e3d757' 
  AND token = 'bTvg4XM+D1+423mgrUUYoaf7ho9bh1UMyqFIbfN5gss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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