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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3134e375c60e81cebbf9355cf2418b743f7a074e3a3f80375982a6e8ed542f09' 
  AND token = '3SsNvokPlj4S2VvhJGG4XALC5TYNziu64dlOTPuQ+DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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