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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cebd5e008a099baf03b379935dd7b94f32f7e59624a559ab240cd8f62acd6d' 
  AND token = 'JkxEyVgt5mlx4zyX5UJub0KrfQMZq+KAG+lpehenMZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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