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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9947547affaee2b1746df02a446c4263751e89502b71d6800f64eaf26310436e' 
  AND token = 'Iz+yyclq8WsGENEshNxdQi1PcnKk3D8Sd2zz4v2jg0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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