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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dfdbffc2e72db7138c268853530d156f9c63c7ffc3659899205f18ce8e99b8' 
  AND token = 'Goih7Un247XRIKLnK4Zv8cnAAGq6Av1lb45LBaohim8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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