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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2168d7e7aa6dff8dba0377e53ee7c54fc608238b880bf8b2487ee3079368337f' 
  AND token = 'd60yHUP+89iN3a4s95X4spE7MqILSUDp7Y5bb5actdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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